Black Diamond Roofing vs Thor Contracting Corporation
East Bay Roofing Comparison · Updated January 2026
| Black Diamond Roofing | Thor Contracting Corporation | |
|---|---|---|
| Rating | ★ 4.0 | ★ 4.9 |
| Years Licensed | 11 years | 4 years |
| License # | 996268 | 1093228 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | El Sobrante, CA |
| Website | www.blackdiamondroofs.com | thorcontractingcorporation.com |
Our Analysis
From customer descriptions, Black Diamond Roofing is often characterized as professional and punctual, with communication and coordination that can support ongoing work for HOA communities. Feedback also indicates that some jobs may involve additional steps, such as returning with a separate proposal after an initial assessment, and experiences appear mixed depending on the situation.
Thor Contracting Corporation is commonly described as professional, responsive, and organized, with frequent mentions of timely arrivals, clear communication about scope and pricing, and efficient scheduling. Reviews also reference jobsite cleanliness and coordination around inspections and permits, as well as instances where customers felt the company worked within budget and provided competitive bids. Overall, the main differences in the provided data are years licensed, base location within the county, and the consistency and process details highlighted in customer feedback.
Why choose Black Diamond Roofing?
- ✓ You want a Concord-based contractor with longer licensure history (11 years) and an active license.
- ✓ HOA or community-managed coordination matters, since customer feedback mentions communication and coordination for HOA-related work.
- ✓ You prefer a contractor that is described as professional and punctual, while being prepared for a process that may include follow-up steps like a separate proposal after an initial visit.
- ✓ You value documented workers’ compensation coverage and a $25,000 bond as part of basic contractor due diligence.
Why choose Thor Contracting Corporation?
- ✓ You want an El Sobrante-based contractor with an active license and 4 years of licensure.
- ✓ You prioritize an organized process with clear communication about scope and pricing, as frequently described by customers.
- ✓ Scheduling speed and turnaround time are important, since reviews mention efficient scheduling and completing work within short windows.
- ✓ Coordination around inspections and permits and maintaining a clean, organized jobsite are factors you want emphasized, along with workers’ compensation coverage and a $25,000 bond.
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Frequently Asked Questions
Yes. Both Black Diamond Roofing and Thor Contracting Corporation are listed with active license status and workers’ compensation coverage.
Both companies list a $25,000 bond.
Black Diamond Roofing is based in Concord, and Thor Contracting Corporation is based in El Sobrante.
Feedback for Black Diamond Roofing mentions professionalism and punctuality, with some jobs involving an additional step such as returning with a separate proposal after an initial assessment. Feedback for Thor Contracting Corporation often mentions an organized process, clear scope and pricing communication, efficient scheduling, and coordination around inspections and permits.
Other East Bay Roofing Comparisons
Thor Contracting Corporation
★ 4.9
Marco Roofing
★ 4.9
Thor Contracting Corporation
★ 4.9
Apollo Roofing Company
★ 5.0
Sierra Roofing and Solar
★ 4.8
Thor Contracting Corporation
★ 4.9
Thor Contracting Corporation
★ 4.9
Dependable Roofing Inc
★ 4.9
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified January 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.